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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

26301 results found.

  1. GRB 100418A: ROVOR optical measurements at 35 hours
  2. GRB 100420A: Swift-BAT refined analysis
  3. GRB 100423B: Fermi GBM detection
  4. GRB 100423A: Swift-BAT refined analysis
  5. Trigger 420256: Swift detection of a possible GRB
  6. GRB 100423A: GROND discovery of afterglow
  7. GRB 100423A: Swift detection of a burst
  8. Radio afterglow detection of GRB 100418A with the EVLA
  9. GRB 100414A: Radio Afterglow Detection with the Expanded VLA
  10. GRB100418A: REM possible afterglow detection
  11. GRB 100418A: Continuing Swift/UVOT Observations
  12. GRB 100418A: RTT150 optical observations
  13. GRB 100414A: CFHT optical observations
  14. GRB 100420A: XRT refined analysis
  15. GRB 100420A: Enhanced Swift-XRT position
  16. GRB 100420A: SARA Upper Limits
  17. GRB 100418A: RTT150 observations during the optical afterglow maximum
  18. GRB 100414A: Confirmation of the X-ray afterglow
  19. GRB 100418A: VLT optical observations
  20. GRB 100420A: Swift detection of a burst
  21. GRB 100418A PAIRITEL NIR Observations
  22. GRB 100418A: ROVOR optical afterglow detection
  23. GRB 100418A: Swift/UVOT Observations
  24. GRB 100413A: GMRT observation of radio afterglow
  25. GRB 100418A: Swift-XRT Refined Analysis
  26. GRB100418A: VLT/X-shooter redshift and photometry
  27. GRB 100418A: GROND observations; missing author list added
  28. GRB 100418A: GROND observations
  29. GRB 100418A: Swift-BAT refined analysis
  30. GRB 100418A: Enhanced Swift-XRT position
  31. GRB 100418A: Swift detection of a burst with a possible optical afterglow
  32. GRB 100413A: Radio Afterglow Detection with the EVLA
  33. GRB 100414A: Suzaku WAM observation of the prompt emission
  34. GRB 100414A: Swift/UVOT Observations
  35. GRB 100414A: GROND Detection of the Optical Afterglow
  36. GRB 100414A: Enhanced Swift-XRT position of candidate afterglow
  37. GRB 100413A: Suzaku WAM observation of the prompt emission
  38. GRB 100414A: Palomar Transient Factory Observations
  39. GRB 100413B: Swift Confirmation of Burst
  40. GRB 100413A: Swift-BAT final refined analysis
  41. GRB 100414A: IPN Localization
  42. Konus-Wind observation of GRB 100414B
  43. GRB 100414A: Fermi GBM detection
  44. GRB100414A: Fermi LAT detection
  45. GRB 100413B : Swift detection of a burst
  46. GRB 100413A: GROND Upper limits
  47. Konus-Wind observation of GRB 100413A
  48. GRB 100413A: Swift-XRT Refined Analysis
  49. GRB 100413A: Swift-BAT initial refined analysis
  50. GRB 100413A: Enhanced Swift-XRT position
  51. GRB 100413A: Swift detection of a burst
  52. Spin down rate and inferred dipole magnetic field of the new soft gamma-ray repeater SGR 1833-0832
  53. INTEGRAL Alert n. 5995: MASTER-Net optical observations
  54. GRB 100331B: GROND Upper limits
  55. GRB 100401A: Swift/UVOT Upper Limit
  56. Swift/BAT trigger 417974 (GRB100401A): Swift/XRT observations
  57. GRB 100401A: Fermi GBM detection
  58. GRB 100401A Burst, possibly short, detected in ground analysis of BAT data
  59. GRB 100316A: R-band limit
  60. GRB 100324B: Suzaku WAM observation of the prompt emission
  61. GRB 100331B: Swift/UVOT Upper Limits
  62. Swift detection of LS V +44 17
  63. GRB 100331B: SuperAGILE Localization of a Long GRB
  64. INTEGRAL trigger 5994 / GRB 100331A: GROND detection of a variable source
  65. Konus-Wind observation of GRB 100324B
  66. GRB 100331A: A long GRB detected by INTEGRAL
  67. IPN triangulation of GRB100324B
  68. Konus-Wind observation of GRB 100322A
  69. Short X-ray Transient detected by MAXI/GSC
  70. GRB 100322A: Suzaku WAM observation of the prompt emission
  71. Fermi/GBM and Swift/BAT detection of a burst from SGR 1806-20
  72. GRB 100325A: Fermi LAT detection
  73. GROND observations of GRB100316D/SN2010bh
  74. GRB 100325A: Fermi GBM detection
  75. GRB 100322B or possible Galactic transient detected in ground analysis of BAT data
  76. GRB 100316D: Spectroscopic Discovery of a Supernova from Magellan
  77. GRB 100322A: Fermi GBM detection
  78. SGR 1833-0832: Archival Chandra Observations
  79. Possible pulsation period in SGR 1833-0832
  80. Probable SGR 1833-0832: Swift-XRT refined analysis
  81. Probable SGR 1833-0832: Enhanced Swift-XRT position
  82. Swift-XRT refined position of the probable new SGR 1833-0832
  83. Swift-BAT refined analysis of the probable new SGR 1833-0832
  84. GRB 100319A: Swift detection of a burst; possible SGR
  85. GRB 100316D: Possible Supernova
  86. GRB 100316D: Pre-burst emission measured by BAT
  87. GRB 100316D: Swift XRT enhanced position and further refined analysis
  88. GRB 100316B: Swift-XRT refined analysis
  89. Tentative redshift of GRB100316D from X-ray data
  90. GRB 100316C: GROND Detection of a Optical/NIR Afterglow Candidate
  91. GRB 100316D: GROND Detection of the Optical/NIR Afterglow Candidate
  92. GRB 100316D: Gemini/GMOS and VLT/X-shooter observations
  93. GRB 100316D: VLT/X-shooter observations
  94. GRB 100316D: Swift-BAT refined analysis
  95. GRB 100316C: Swift-BAT refined analysis
  96. GRB 100316C: Swift-XRT team refined analysis
  97. GRB 100316C: Enhanced Swift-XRT position
  98. GRB 100316A: TAROT Calern observatory optical observations
  99. GRB 100316A: Swift-XRT refined analysis
  100. GRB 100316B: Enhanced Swift-XRT position

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